The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1 | |
| 2 | /* pngread.c - read a PNG file |
| 3 | * |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 4 | * Last changed in libpng 1.2.44 [June 26, 2010] |
| 5 | * Copyright (c) 1998-2010 Glenn Randers-Pehrson |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| 7 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
| 8 | * |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 9 | * This code is released under the libpng license. |
| 10 | * For conditions of distribution and use, see the disclaimer |
| 11 | * and license in png.h |
| 12 | * |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 13 | * This file contains routines that an application calls directly to |
| 14 | * read a PNG file or stream. |
| 15 | */ |
| 16 | |
| 17 | #define PNG_INTERNAL |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 18 | #define PNG_NO_PEDANTIC_WARNINGS |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 19 | #include "png.h" |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 20 | #ifdef PNG_READ_SUPPORTED |
| 21 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 22 | |
| 23 | /* Create a PNG structure for reading, and allocate any memory needed. */ |
| 24 | png_structp PNGAPI |
| 25 | png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr, |
| 26 | png_error_ptr error_fn, png_error_ptr warn_fn) |
| 27 | { |
| 28 | |
| 29 | #ifdef PNG_USER_MEM_SUPPORTED |
| 30 | return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn, |
| 31 | warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL)); |
| 32 | } |
| 33 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 34 | /* Alternate create PNG structure for reading, and allocate any memory |
| 35 | * needed. |
| 36 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 37 | png_structp PNGAPI |
| 38 | png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, |
| 39 | png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, |
| 40 | png_malloc_ptr malloc_fn, png_free_ptr free_fn) |
| 41 | { |
| 42 | #endif /* PNG_USER_MEM_SUPPORTED */ |
| 43 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 44 | #ifdef PNG_SETJMP_SUPPORTED |
| 45 | volatile |
| 46 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 47 | png_structp png_ptr; |
| 48 | |
| 49 | #ifdef PNG_SETJMP_SUPPORTED |
| 50 | #ifdef USE_FAR_KEYWORD |
| 51 | jmp_buf jmpbuf; |
| 52 | #endif |
| 53 | #endif |
| 54 | |
| 55 | int i; |
| 56 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 57 | png_debug(1, "in png_create_read_struct"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 58 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 59 | #ifdef PNG_USER_MEM_SUPPORTED |
| 60 | png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG, |
| 61 | (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr); |
| 62 | #else |
| 63 | png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); |
| 64 | #endif |
| 65 | if (png_ptr == NULL) |
| 66 | return (NULL); |
| 67 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 68 | /* Added at libpng-1.2.6 */ |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 69 | #ifdef PNG_USER_LIMITS_SUPPORTED |
| 70 | png_ptr->user_width_max = PNG_USER_WIDTH_MAX; |
| 71 | png_ptr->user_height_max = PNG_USER_HEIGHT_MAX; |
| 72 | # ifdef PNG_USER_CHUNK_CACHE_MAX |
| 73 | /* Added at libpng-1.2.43 and 1.4.0 */ |
| 74 | png_ptr->user_chunk_cache_max = PNG_USER_CHUNK_CACHE_MAX; |
| 75 | # endif |
| 76 | # ifdef PNG_SET_USER_CHUNK_MALLOC_MAX |
| 77 | /* Added at libpng-1.2.43 and 1.4.1 */ |
| 78 | png_ptr->user_chunk_malloc_max = PNG_USER_CHUNK_MALLOC_MAX; |
| 79 | # endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 80 | #endif |
| 81 | |
| 82 | #ifdef PNG_SETJMP_SUPPORTED |
| 83 | #ifdef USE_FAR_KEYWORD |
| 84 | if (setjmp(jmpbuf)) |
| 85 | #else |
| 86 | if (setjmp(png_ptr->jmpbuf)) |
| 87 | #endif |
| 88 | { |
| 89 | png_free(png_ptr, png_ptr->zbuf); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 90 | png_ptr->zbuf = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 91 | #ifdef PNG_USER_MEM_SUPPORTED |
| 92 | png_destroy_struct_2((png_voidp)png_ptr, |
| 93 | (png_free_ptr)free_fn, (png_voidp)mem_ptr); |
| 94 | #else |
| 95 | png_destroy_struct((png_voidp)png_ptr); |
| 96 | #endif |
| 97 | return (NULL); |
| 98 | } |
| 99 | #ifdef USE_FAR_KEYWORD |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 100 | png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 101 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 102 | #endif /* PNG_SETJMP_SUPPORTED */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 103 | |
| 104 | #ifdef PNG_USER_MEM_SUPPORTED |
| 105 | png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn); |
| 106 | #endif |
| 107 | |
| 108 | png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn); |
| 109 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 110 | if (user_png_ver) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 111 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 112 | i = 0; |
| 113 | do |
| 114 | { |
| 115 | if (user_png_ver[i] != png_libpng_ver[i]) |
| 116 | png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; |
| 117 | } while (png_libpng_ver[i++]); |
| 118 | } |
| 119 | else |
| 120 | png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 121 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 122 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 123 | if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH) |
| 124 | { |
| 125 | /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so |
| 126 | * we must recompile any applications that use any older library version. |
| 127 | * For versions after libpng 1.0, we will be compatible, so we need |
| 128 | * only check the first digit. |
| 129 | */ |
| 130 | if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || |
| 131 | (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) || |
| 132 | (user_png_ver[0] == '0' && user_png_ver[2] < '9')) |
| 133 | { |
| 134 | #if defined(PNG_STDIO_SUPPORTED) && !defined(_WIN32_WCE) |
| 135 | char msg[80]; |
| 136 | if (user_png_ver) |
| 137 | { |
| 138 | png_snprintf(msg, 80, |
| 139 | "Application was compiled with png.h from libpng-%.20s", |
| 140 | user_png_ver); |
| 141 | png_warning(png_ptr, msg); |
| 142 | } |
| 143 | png_snprintf(msg, 80, |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 144 | "Application is running with png.c from libpng-%.20s", |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 145 | png_libpng_ver); |
| 146 | png_warning(png_ptr, msg); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 147 | #endif |
| 148 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 149 | png_ptr->flags = 0; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 150 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 151 | png_error(png_ptr, |
| 152 | "Incompatible libpng version in application and library"); |
| 153 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 154 | } |
| 155 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 156 | /* Initialize zbuf - compression buffer */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 157 | png_ptr->zbuf_size = PNG_ZBUF_SIZE; |
| 158 | png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, |
| 159 | (png_uint_32)png_ptr->zbuf_size); |
| 160 | png_ptr->zstream.zalloc = png_zalloc; |
| 161 | png_ptr->zstream.zfree = png_zfree; |
| 162 | png_ptr->zstream.opaque = (voidpf)png_ptr; |
| 163 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 164 | switch (inflateInit(&png_ptr->zstream)) |
| 165 | { |
| 166 | case Z_OK: /* Do nothing */ break; |
| 167 | case Z_MEM_ERROR: |
| 168 | case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); |
| 169 | break; |
| 170 | case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error"); |
| 171 | break; |
| 172 | default: png_error(png_ptr, "Unknown zlib error"); |
| 173 | } |
| 174 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 175 | |
| 176 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 177 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 178 | |
| 179 | png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL); |
| 180 | |
| 181 | #ifdef PNG_SETJMP_SUPPORTED |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 182 | /* Applications that neglect to set up their own setjmp() and then |
| 183 | encounter a png_error() will longjmp here. Since the jmpbuf is |
| 184 | then meaningless we abort instead of returning. */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 185 | #ifdef USE_FAR_KEYWORD |
| 186 | if (setjmp(jmpbuf)) |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 187 | PNG_ABORT(); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 188 | png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 189 | #else |
| 190 | if (setjmp(png_ptr->jmpbuf)) |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 191 | PNG_ABORT(); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 192 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 193 | #endif /* PNG_SETJMP_SUPPORTED */ |
| 194 | |
Joseph Wen | 4ce0ee1 | 2010-08-20 10:42:22 +0800 | [diff] [blame] | 195 | #ifdef PNG_INDEX_SUPPORTED |
| 196 | png_ptr->index = NULL; |
| 197 | #endif |
| 198 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 199 | return (png_ptr); |
| 200 | } |
| 201 | |
| 202 | #if defined(PNG_1_0_X) || defined(PNG_1_2_X) |
| 203 | /* Initialize PNG structure for reading, and allocate any memory needed. |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 204 | * This interface is deprecated in favour of the png_create_read_struct(), |
| 205 | * and it will disappear as of libpng-1.3.0. |
| 206 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 207 | #undef png_read_init |
| 208 | void PNGAPI |
| 209 | png_read_init(png_structp png_ptr) |
| 210 | { |
| 211 | /* We only come here via pre-1.0.7-compiled applications */ |
| 212 | png_read_init_2(png_ptr, "1.0.6 or earlier", 0, 0); |
| 213 | } |
| 214 | |
| 215 | void PNGAPI |
| 216 | png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver, |
| 217 | png_size_t png_struct_size, png_size_t png_info_size) |
| 218 | { |
| 219 | /* We only come here via pre-1.0.12-compiled applications */ |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 220 | if (png_ptr == NULL) |
| 221 | return; |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 222 | #if defined(PNG_STDIO_SUPPORTED) && !defined(_WIN32_WCE) |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 223 | if (png_sizeof(png_struct) > png_struct_size || |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 224 | png_sizeof(png_info) > png_info_size) |
| 225 | { |
| 226 | char msg[80]; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 227 | png_ptr->warning_fn = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 228 | if (user_png_ver) |
| 229 | { |
| 230 | png_snprintf(msg, 80, |
| 231 | "Application was compiled with png.h from libpng-%.20s", |
| 232 | user_png_ver); |
| 233 | png_warning(png_ptr, msg); |
| 234 | } |
| 235 | png_snprintf(msg, 80, |
| 236 | "Application is running with png.c from libpng-%.20s", |
| 237 | png_libpng_ver); |
| 238 | png_warning(png_ptr, msg); |
| 239 | } |
| 240 | #endif |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 241 | if (png_sizeof(png_struct) > png_struct_size) |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 242 | { |
| 243 | png_ptr->error_fn = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 244 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 245 | png_ptr->flags = 0; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 246 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 247 | png_error(png_ptr, |
| 248 | "The png struct allocated by the application for reading is" |
| 249 | " too small."); |
| 250 | } |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 251 | if (png_sizeof(png_info) > png_info_size) |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 252 | { |
| 253 | png_ptr->error_fn = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 254 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 255 | png_ptr->flags = 0; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 256 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 257 | png_error(png_ptr, |
| 258 | "The info struct allocated by application for reading is" |
| 259 | " too small."); |
| 260 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 261 | png_read_init_3(&png_ptr, user_png_ver, png_struct_size); |
| 262 | } |
| 263 | #endif /* PNG_1_0_X || PNG_1_2_X */ |
| 264 | |
| 265 | void PNGAPI |
| 266 | png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver, |
| 267 | png_size_t png_struct_size) |
| 268 | { |
| 269 | #ifdef PNG_SETJMP_SUPPORTED |
| 270 | jmp_buf tmp_jmp; /* to save current jump buffer */ |
| 271 | #endif |
| 272 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 273 | int i = 0; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 274 | |
| 275 | png_structp png_ptr=*ptr_ptr; |
| 276 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 277 | if (png_ptr == NULL) |
| 278 | return; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 279 | |
| 280 | do |
| 281 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 282 | if (user_png_ver[i] != png_libpng_ver[i]) |
| 283 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 284 | #ifdef PNG_LEGACY_SUPPORTED |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 285 | png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 286 | #else |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 287 | png_ptr->warning_fn = NULL; |
| 288 | png_warning(png_ptr, |
| 289 | "Application uses deprecated png_read_init() and should be" |
| 290 | " recompiled."); |
| 291 | break; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 292 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 293 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 294 | } while (png_libpng_ver[i++]); |
| 295 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 296 | png_debug(1, "in png_read_init_3"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 297 | |
| 298 | #ifdef PNG_SETJMP_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 299 | /* Save jump buffer and error functions */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 300 | png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 301 | #endif |
| 302 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 303 | if (png_sizeof(png_struct) > png_struct_size) |
| 304 | { |
| 305 | png_destroy_struct(png_ptr); |
| 306 | *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); |
| 307 | png_ptr = *ptr_ptr; |
| 308 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 309 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 310 | /* Reset all variables to 0 */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 311 | png_memset(png_ptr, 0, png_sizeof(png_struct)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 312 | |
| 313 | #ifdef PNG_SETJMP_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 314 | /* Restore jump buffer */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 315 | png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 316 | #endif |
| 317 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 318 | /* Added at libpng-1.2.6 */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 319 | #ifdef PNG_SET_USER_LIMITS_SUPPORTED |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 320 | png_ptr->user_width_max = PNG_USER_WIDTH_MAX; |
| 321 | png_ptr->user_height_max = PNG_USER_HEIGHT_MAX; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 322 | #endif |
| 323 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 324 | /* Initialize zbuf - compression buffer */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 325 | png_ptr->zbuf_size = PNG_ZBUF_SIZE; |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 326 | png_ptr->zstream.zalloc = png_zalloc; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 327 | png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, |
| 328 | (png_uint_32)png_ptr->zbuf_size); |
| 329 | png_ptr->zstream.zalloc = png_zalloc; |
| 330 | png_ptr->zstream.zfree = png_zfree; |
| 331 | png_ptr->zstream.opaque = (voidpf)png_ptr; |
| 332 | |
| 333 | switch (inflateInit(&png_ptr->zstream)) |
| 334 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 335 | case Z_OK: /* Do nothing */ break; |
| 336 | case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break; |
| 337 | case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error"); |
| 338 | break; |
| 339 | default: png_error(png_ptr, "Unknown zlib error"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 340 | } |
| 341 | |
| 342 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 343 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 344 | |
| 345 | png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL); |
| 346 | } |
| 347 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 348 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 349 | /* Read the information before the actual image data. This has been |
| 350 | * changed in v0.90 to allow reading a file that already has the magic |
| 351 | * bytes read from the stream. You can tell libpng how many bytes have |
| 352 | * been read from the beginning of the stream (up to the maximum of 8) |
| 353 | * via png_set_sig_bytes(), and we will only check the remaining bytes |
| 354 | * here. The application can then have access to the signature bytes we |
| 355 | * read if it is determined that this isn't a valid PNG file. |
| 356 | */ |
| 357 | void PNGAPI |
| 358 | png_read_info(png_structp png_ptr, png_infop info_ptr) |
| 359 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 360 | png_debug(1, "in png_read_info"); |
| 361 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 362 | if (png_ptr == NULL || info_ptr == NULL) |
| 363 | return; |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 364 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 365 | /* If we haven't checked all of the PNG signature bytes, do so now. */ |
| 366 | if (png_ptr->sig_bytes < 8) |
| 367 | { |
| 368 | png_size_t num_checked = png_ptr->sig_bytes, |
| 369 | num_to_check = 8 - num_checked; |
| 370 | |
| 371 | png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check); |
| 372 | png_ptr->sig_bytes = 8; |
| 373 | |
| 374 | if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check)) |
| 375 | { |
| 376 | if (num_checked < 4 && |
| 377 | png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4)) |
| 378 | png_error(png_ptr, "Not a PNG file"); |
| 379 | else |
| 380 | png_error(png_ptr, "PNG file corrupted by ASCII conversion"); |
| 381 | } |
| 382 | if (num_checked < 3) |
| 383 | png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE; |
| 384 | } |
| 385 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 386 | for (;;) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 387 | { |
| 388 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 389 | PNG_CONST PNG_IHDR; |
| 390 | PNG_CONST PNG_IDAT; |
| 391 | PNG_CONST PNG_IEND; |
| 392 | PNG_CONST PNG_PLTE; |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 393 | #ifdef PNG_READ_bKGD_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 394 | PNG_CONST PNG_bKGD; |
| 395 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 396 | #ifdef PNG_READ_cHRM_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 397 | PNG_CONST PNG_cHRM; |
| 398 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 399 | #ifdef PNG_READ_gAMA_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 400 | PNG_CONST PNG_gAMA; |
| 401 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 402 | #ifdef PNG_READ_hIST_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 403 | PNG_CONST PNG_hIST; |
| 404 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 405 | #ifdef PNG_READ_iCCP_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 406 | PNG_CONST PNG_iCCP; |
| 407 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 408 | #ifdef PNG_READ_iTXt_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 409 | PNG_CONST PNG_iTXt; |
| 410 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 411 | #ifdef PNG_READ_oFFs_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 412 | PNG_CONST PNG_oFFs; |
| 413 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 414 | #ifdef PNG_READ_pCAL_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 415 | PNG_CONST PNG_pCAL; |
| 416 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 417 | #ifdef PNG_READ_pHYs_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 418 | PNG_CONST PNG_pHYs; |
| 419 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 420 | #ifdef PNG_READ_sBIT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 421 | PNG_CONST PNG_sBIT; |
| 422 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 423 | #ifdef PNG_READ_sCAL_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 424 | PNG_CONST PNG_sCAL; |
| 425 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 426 | #ifdef PNG_READ_sPLT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 427 | PNG_CONST PNG_sPLT; |
| 428 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 429 | #ifdef PNG_READ_sRGB_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 430 | PNG_CONST PNG_sRGB; |
| 431 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 432 | #ifdef PNG_READ_tEXt_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 433 | PNG_CONST PNG_tEXt; |
| 434 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 435 | #ifdef PNG_READ_tIME_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 436 | PNG_CONST PNG_tIME; |
| 437 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 438 | #ifdef PNG_READ_tRNS_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 439 | PNG_CONST PNG_tRNS; |
| 440 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 441 | #ifdef PNG_READ_zTXt_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 442 | PNG_CONST PNG_zTXt; |
| 443 | #endif |
| 444 | #endif /* PNG_USE_LOCAL_ARRAYS */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 445 | png_uint_32 length = png_read_chunk_header(png_ptr); |
| 446 | PNG_CONST png_bytep chunk_name = png_ptr->chunk_name; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 447 | |
| 448 | /* This should be a binary subdivision search or a hash for |
| 449 | * matching the chunk name rather than a linear search. |
| 450 | */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 451 | if (!png_memcmp(chunk_name, png_IDAT, 4)) |
| 452 | if (png_ptr->mode & PNG_AFTER_IDAT) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 453 | png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT; |
| 454 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 455 | if (!png_memcmp(chunk_name, png_IHDR, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 456 | png_handle_IHDR(png_ptr, info_ptr, length); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 457 | else if (!png_memcmp(chunk_name, png_IEND, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 458 | png_handle_IEND(png_ptr, info_ptr, length); |
| 459 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 460 | else if (png_handle_as_unknown(png_ptr, chunk_name)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 461 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 462 | if (!png_memcmp(chunk_name, png_IDAT, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 463 | png_ptr->mode |= PNG_HAVE_IDAT; |
| 464 | png_handle_unknown(png_ptr, info_ptr, length); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 465 | if (!png_memcmp(chunk_name, png_PLTE, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 466 | png_ptr->mode |= PNG_HAVE_PLTE; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 467 | else if (!png_memcmp(chunk_name, png_IDAT, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 468 | { |
| 469 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 470 | png_error(png_ptr, "Missing IHDR before IDAT"); |
| 471 | else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && |
| 472 | !(png_ptr->mode & PNG_HAVE_PLTE)) |
| 473 | png_error(png_ptr, "Missing PLTE before IDAT"); |
| 474 | break; |
| 475 | } |
| 476 | } |
| 477 | #endif |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 478 | else if (!png_memcmp(chunk_name, png_PLTE, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 479 | png_handle_PLTE(png_ptr, info_ptr, length); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 480 | else if (!png_memcmp(chunk_name, png_IDAT, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 481 | { |
| 482 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 483 | png_error(png_ptr, "Missing IHDR before IDAT"); |
| 484 | else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && |
| 485 | !(png_ptr->mode & PNG_HAVE_PLTE)) |
| 486 | png_error(png_ptr, "Missing PLTE before IDAT"); |
| 487 | |
| 488 | png_ptr->idat_size = length; |
| 489 | png_ptr->mode |= PNG_HAVE_IDAT; |
| 490 | break; |
| 491 | } |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 492 | #ifdef PNG_READ_bKGD_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 493 | else if (!png_memcmp(chunk_name, png_bKGD, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 494 | png_handle_bKGD(png_ptr, info_ptr, length); |
| 495 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 496 | #ifdef PNG_READ_cHRM_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 497 | else if (!png_memcmp(chunk_name, png_cHRM, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 498 | png_handle_cHRM(png_ptr, info_ptr, length); |
| 499 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 500 | #ifdef PNG_READ_gAMA_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 501 | else if (!png_memcmp(chunk_name, png_gAMA, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 502 | png_handle_gAMA(png_ptr, info_ptr, length); |
| 503 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 504 | #ifdef PNG_READ_hIST_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 505 | else if (!png_memcmp(chunk_name, png_hIST, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 506 | png_handle_hIST(png_ptr, info_ptr, length); |
| 507 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 508 | #ifdef PNG_READ_oFFs_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 509 | else if (!png_memcmp(chunk_name, png_oFFs, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 510 | png_handle_oFFs(png_ptr, info_ptr, length); |
| 511 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 512 | #ifdef PNG_READ_pCAL_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 513 | else if (!png_memcmp(chunk_name, png_pCAL, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 514 | png_handle_pCAL(png_ptr, info_ptr, length); |
| 515 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 516 | #ifdef PNG_READ_sCAL_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 517 | else if (!png_memcmp(chunk_name, png_sCAL, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 518 | png_handle_sCAL(png_ptr, info_ptr, length); |
| 519 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 520 | #ifdef PNG_READ_pHYs_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 521 | else if (!png_memcmp(chunk_name, png_pHYs, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 522 | png_handle_pHYs(png_ptr, info_ptr, length); |
| 523 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 524 | #ifdef PNG_READ_sBIT_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 525 | else if (!png_memcmp(chunk_name, png_sBIT, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 526 | png_handle_sBIT(png_ptr, info_ptr, length); |
| 527 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 528 | #ifdef PNG_READ_sRGB_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 529 | else if (!png_memcmp(chunk_name, png_sRGB, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 530 | png_handle_sRGB(png_ptr, info_ptr, length); |
| 531 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 532 | #ifdef PNG_READ_iCCP_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 533 | else if (!png_memcmp(chunk_name, png_iCCP, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 534 | png_handle_iCCP(png_ptr, info_ptr, length); |
| 535 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 536 | #ifdef PNG_READ_sPLT_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 537 | else if (!png_memcmp(chunk_name, png_sPLT, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 538 | png_handle_sPLT(png_ptr, info_ptr, length); |
| 539 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 540 | #ifdef PNG_READ_tEXt_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 541 | else if (!png_memcmp(chunk_name, png_tEXt, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 542 | png_handle_tEXt(png_ptr, info_ptr, length); |
| 543 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 544 | #ifdef PNG_READ_tIME_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 545 | else if (!png_memcmp(chunk_name, png_tIME, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 546 | png_handle_tIME(png_ptr, info_ptr, length); |
| 547 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 548 | #ifdef PNG_READ_tRNS_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 549 | else if (!png_memcmp(chunk_name, png_tRNS, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 550 | png_handle_tRNS(png_ptr, info_ptr, length); |
| 551 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 552 | #ifdef PNG_READ_zTXt_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 553 | else if (!png_memcmp(chunk_name, png_zTXt, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 554 | png_handle_zTXt(png_ptr, info_ptr, length); |
| 555 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 556 | #ifdef PNG_READ_iTXt_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 557 | else if (!png_memcmp(chunk_name, png_iTXt, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 558 | png_handle_iTXt(png_ptr, info_ptr, length); |
| 559 | #endif |
| 560 | else |
| 561 | png_handle_unknown(png_ptr, info_ptr, length); |
| 562 | } |
| 563 | } |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 564 | #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 565 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 566 | /* Optional call to update the users info_ptr structure */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 567 | void PNGAPI |
| 568 | png_read_update_info(png_structp png_ptr, png_infop info_ptr) |
| 569 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 570 | png_debug(1, "in png_read_update_info"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 571 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 572 | if (png_ptr == NULL) |
| 573 | return; |
Joseph Wen | 4ce0ee1 | 2010-08-20 10:42:22 +0800 | [diff] [blame] | 574 | #ifdef PNG_INDEX_SUPPORTED |
| 575 | if (png_ptr->index) { |
| 576 | png_read_start_row(png_ptr); |
| 577 | } |
| 578 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 579 | if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) |
| 580 | png_read_start_row(png_ptr); |
| 581 | else |
| 582 | png_warning(png_ptr, |
| 583 | "Ignoring extra png_read_update_info() call; row buffer not reallocated"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 584 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 585 | png_read_transform_info(png_ptr, info_ptr); |
| 586 | } |
| 587 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 588 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 589 | /* Initialize palette, background, etc, after transformations |
| 590 | * are set, but before any reading takes place. This allows |
| 591 | * the user to obtain a gamma-corrected palette, for example. |
| 592 | * If the user doesn't call this, we will do it ourselves. |
| 593 | */ |
| 594 | void PNGAPI |
| 595 | png_start_read_image(png_structp png_ptr) |
| 596 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 597 | png_debug(1, "in png_start_read_image"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 598 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 599 | if (png_ptr == NULL) |
| 600 | return; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 601 | if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) |
| 602 | png_read_start_row(png_ptr); |
| 603 | } |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 604 | #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 605 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 606 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 607 | void PNGAPI |
| 608 | png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) |
| 609 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 610 | PNG_CONST PNG_IDAT; |
| 611 | PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 612 | 0xff}; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 613 | PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 614 | int ret; |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 615 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 616 | if (png_ptr == NULL) |
| 617 | return; |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 618 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 619 | png_debug2(1, "in png_read_row (row %lu, pass %d)", |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 620 | png_ptr->row_number, png_ptr->pass); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 621 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 622 | if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) |
| 623 | png_read_start_row(png_ptr); |
| 624 | if (png_ptr->row_number == 0 && png_ptr->pass == 0) |
| 625 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 626 | /* Check for transforms that have been set but were defined out */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 627 | #if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED) |
| 628 | if (png_ptr->transformations & PNG_INVERT_MONO) |
| 629 | png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined."); |
| 630 | #endif |
| 631 | #if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED) |
| 632 | if (png_ptr->transformations & PNG_FILLER) |
| 633 | png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined."); |
| 634 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 635 | #if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && \ |
| 636 | !defined(PNG_READ_PACKSWAP_SUPPORTED) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 637 | if (png_ptr->transformations & PNG_PACKSWAP) |
| 638 | png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined."); |
| 639 | #endif |
| 640 | #if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED) |
| 641 | if (png_ptr->transformations & PNG_PACK) |
| 642 | png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined."); |
| 643 | #endif |
| 644 | #if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED) |
| 645 | if (png_ptr->transformations & PNG_SHIFT) |
| 646 | png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined."); |
| 647 | #endif |
| 648 | #if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED) |
| 649 | if (png_ptr->transformations & PNG_BGR) |
| 650 | png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined."); |
| 651 | #endif |
| 652 | #if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED) |
| 653 | if (png_ptr->transformations & PNG_SWAP_BYTES) |
| 654 | png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined."); |
| 655 | #endif |
| 656 | } |
| 657 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 658 | #ifdef PNG_READ_INTERLACING_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 659 | /* If interlaced and we do not need a new row, combine row and return */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 660 | if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) |
| 661 | { |
| 662 | switch (png_ptr->pass) |
| 663 | { |
| 664 | case 0: |
| 665 | if (png_ptr->row_number & 0x07) |
| 666 | { |
| 667 | if (dsp_row != NULL) |
| 668 | png_combine_row(png_ptr, dsp_row, |
| 669 | png_pass_dsp_mask[png_ptr->pass]); |
| 670 | png_read_finish_row(png_ptr); |
| 671 | return; |
| 672 | } |
| 673 | break; |
| 674 | case 1: |
| 675 | if ((png_ptr->row_number & 0x07) || png_ptr->width < 5) |
| 676 | { |
| 677 | if (dsp_row != NULL) |
| 678 | png_combine_row(png_ptr, dsp_row, |
| 679 | png_pass_dsp_mask[png_ptr->pass]); |
| 680 | png_read_finish_row(png_ptr); |
| 681 | return; |
| 682 | } |
| 683 | break; |
| 684 | case 2: |
| 685 | if ((png_ptr->row_number & 0x07) != 4) |
| 686 | { |
| 687 | if (dsp_row != NULL && (png_ptr->row_number & 4)) |
| 688 | png_combine_row(png_ptr, dsp_row, |
| 689 | png_pass_dsp_mask[png_ptr->pass]); |
| 690 | png_read_finish_row(png_ptr); |
| 691 | return; |
| 692 | } |
| 693 | break; |
| 694 | case 3: |
| 695 | if ((png_ptr->row_number & 3) || png_ptr->width < 3) |
| 696 | { |
| 697 | if (dsp_row != NULL) |
| 698 | png_combine_row(png_ptr, dsp_row, |
| 699 | png_pass_dsp_mask[png_ptr->pass]); |
| 700 | png_read_finish_row(png_ptr); |
| 701 | return; |
| 702 | } |
| 703 | break; |
| 704 | case 4: |
| 705 | if ((png_ptr->row_number & 3) != 2) |
| 706 | { |
| 707 | if (dsp_row != NULL && (png_ptr->row_number & 2)) |
| 708 | png_combine_row(png_ptr, dsp_row, |
| 709 | png_pass_dsp_mask[png_ptr->pass]); |
| 710 | png_read_finish_row(png_ptr); |
| 711 | return; |
| 712 | } |
| 713 | break; |
| 714 | case 5: |
| 715 | if ((png_ptr->row_number & 1) || png_ptr->width < 2) |
| 716 | { |
| 717 | if (dsp_row != NULL) |
| 718 | png_combine_row(png_ptr, dsp_row, |
| 719 | png_pass_dsp_mask[png_ptr->pass]); |
| 720 | png_read_finish_row(png_ptr); |
| 721 | return; |
| 722 | } |
| 723 | break; |
| 724 | case 6: |
| 725 | if (!(png_ptr->row_number & 1)) |
| 726 | { |
| 727 | png_read_finish_row(png_ptr); |
| 728 | return; |
| 729 | } |
| 730 | break; |
| 731 | } |
| 732 | } |
| 733 | #endif |
| 734 | |
| 735 | if (!(png_ptr->mode & PNG_HAVE_IDAT)) |
| 736 | png_error(png_ptr, "Invalid attempt to read row data"); |
| 737 | |
| 738 | png_ptr->zstream.next_out = png_ptr->row_buf; |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 739 | png_ptr->zstream.avail_out = |
| 740 | (uInt)(PNG_ROWBYTES(png_ptr->pixel_depth, |
| 741 | png_ptr->iwidth) + 1); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 742 | do |
| 743 | { |
| 744 | if (!(png_ptr->zstream.avail_in)) |
| 745 | { |
| 746 | while (!png_ptr->idat_size) |
| 747 | { |
Joseph Wen | 4ce0ee1 | 2010-08-20 10:42:22 +0800 | [diff] [blame] | 748 | #ifdef PNG_INDEX_SUPPORTED |
| 749 | if (png_ptr->index) { |
| 750 | png_opt_crc_finish(png_ptr, 0, 0); |
| 751 | png_ptr->index->stream_idat_position = png_ptr->total_data_read; |
| 752 | } else |
| 753 | #endif |
| 754 | png_crc_finish(png_ptr, 0); |
| 755 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 756 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 757 | png_ptr->idat_size = png_read_chunk_header(png_ptr); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 758 | if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
| 759 | png_error(png_ptr, "Not enough image data"); |
| 760 | } |
| 761 | png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size; |
| 762 | png_ptr->zstream.next_in = png_ptr->zbuf; |
| 763 | if (png_ptr->zbuf_size > png_ptr->idat_size) |
| 764 | png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size; |
| 765 | png_crc_read(png_ptr, png_ptr->zbuf, |
| 766 | (png_size_t)png_ptr->zstream.avail_in); |
| 767 | png_ptr->idat_size -= png_ptr->zstream.avail_in; |
| 768 | } |
| 769 | ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); |
| 770 | if (ret == Z_STREAM_END) |
| 771 | { |
| 772 | if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in || |
| 773 | png_ptr->idat_size) |
| 774 | png_error(png_ptr, "Extra compressed data"); |
| 775 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 776 | png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; |
| 777 | break; |
| 778 | } |
| 779 | if (ret != Z_OK) |
Joseph Wen | 4ce0ee1 | 2010-08-20 10:42:22 +0800 | [diff] [blame] | 780 | #ifdef PNG_INDEX_SUPPORTED |
| 781 | if (png_ptr->index && png_ptr->row_number != png_ptr->height - 1) |
| 782 | #endif |
| 783 | png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg : |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 784 | "Decompression error"); |
| 785 | |
| 786 | } while (png_ptr->zstream.avail_out); |
| 787 | |
| 788 | png_ptr->row_info.color_type = png_ptr->color_type; |
| 789 | png_ptr->row_info.width = png_ptr->iwidth; |
| 790 | png_ptr->row_info.channels = png_ptr->channels; |
| 791 | png_ptr->row_info.bit_depth = png_ptr->bit_depth; |
| 792 | png_ptr->row_info.pixel_depth = png_ptr->pixel_depth; |
| 793 | png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth, |
| 794 | png_ptr->row_info.width); |
| 795 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 796 | if (png_ptr->row_buf[0]) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 797 | png_read_filter_row(png_ptr, &(png_ptr->row_info), |
| 798 | png_ptr->row_buf + 1, png_ptr->prev_row + 1, |
| 799 | (int)(png_ptr->row_buf[0])); |
| 800 | |
| 801 | png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf, |
| 802 | png_ptr->rowbytes + 1); |
| 803 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 804 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 805 | if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 806 | (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING)) |
| 807 | { |
| 808 | /* Intrapixel differencing */ |
| 809 | png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1); |
| 810 | } |
| 811 | #endif |
| 812 | |
| 813 | |
| 814 | if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA)) |
| 815 | png_do_read_transformations(png_ptr); |
| 816 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 817 | #ifdef PNG_READ_INTERLACING_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 818 | /* Blow up interlaced rows to full size */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 819 | if (png_ptr->interlaced && |
| 820 | (png_ptr->transformations & PNG_INTERLACE)) |
| 821 | { |
| 822 | if (png_ptr->pass < 6) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 823 | /* Old interface (pre-1.0.9): |
| 824 | * png_do_read_interlace(&(png_ptr->row_info), |
| 825 | * png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations); |
| 826 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 827 | png_do_read_interlace(png_ptr); |
| 828 | |
| 829 | if (dsp_row != NULL) |
| 830 | png_combine_row(png_ptr, dsp_row, |
| 831 | png_pass_dsp_mask[png_ptr->pass]); |
| 832 | if (row != NULL) |
| 833 | png_combine_row(png_ptr, row, |
| 834 | png_pass_mask[png_ptr->pass]); |
| 835 | } |
| 836 | else |
| 837 | #endif |
| 838 | { |
| 839 | if (row != NULL) |
| 840 | png_combine_row(png_ptr, row, 0xff); |
| 841 | if (dsp_row != NULL) |
| 842 | png_combine_row(png_ptr, dsp_row, 0xff); |
| 843 | } |
| 844 | png_read_finish_row(png_ptr); |
| 845 | |
| 846 | if (png_ptr->read_row_fn != NULL) |
| 847 | (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass); |
| 848 | } |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 849 | #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 850 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 851 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 852 | /* Read one or more rows of image data. If the image is interlaced, |
| 853 | * and png_set_interlace_handling() has been called, the rows need to |
| 854 | * contain the contents of the rows from the previous pass. If the |
| 855 | * image has alpha or transparency, and png_handle_alpha()[*] has been |
| 856 | * called, the rows contents must be initialized to the contents of the |
| 857 | * screen. |
| 858 | * |
| 859 | * "row" holds the actual image, and pixels are placed in it |
| 860 | * as they arrive. If the image is displayed after each pass, it will |
| 861 | * appear to "sparkle" in. "display_row" can be used to display a |
| 862 | * "chunky" progressive image, with finer detail added as it becomes |
| 863 | * available. If you do not want this "chunky" display, you may pass |
| 864 | * NULL for display_row. If you do not want the sparkle display, and |
| 865 | * you have not called png_handle_alpha(), you may pass NULL for rows. |
| 866 | * If you have called png_handle_alpha(), and the image has either an |
| 867 | * alpha channel or a transparency chunk, you must provide a buffer for |
| 868 | * rows. In this case, you do not have to provide a display_row buffer |
| 869 | * also, but you may. If the image is not interlaced, or if you have |
| 870 | * not called png_set_interlace_handling(), the display_row buffer will |
| 871 | * be ignored, so pass NULL to it. |
| 872 | * |
| 873 | * [*] png_handle_alpha() does not exist yet, as of this version of libpng |
| 874 | */ |
| 875 | |
| 876 | void PNGAPI |
| 877 | png_read_rows(png_structp png_ptr, png_bytepp row, |
| 878 | png_bytepp display_row, png_uint_32 num_rows) |
| 879 | { |
| 880 | png_uint_32 i; |
| 881 | png_bytepp rp; |
| 882 | png_bytepp dp; |
| 883 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 884 | png_debug(1, "in png_read_rows"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 885 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 886 | if (png_ptr == NULL) |
| 887 | return; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 888 | rp = row; |
| 889 | dp = display_row; |
| 890 | if (rp != NULL && dp != NULL) |
| 891 | for (i = 0; i < num_rows; i++) |
| 892 | { |
| 893 | png_bytep rptr = *rp++; |
| 894 | png_bytep dptr = *dp++; |
| 895 | |
| 896 | png_read_row(png_ptr, rptr, dptr); |
| 897 | } |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 898 | else if (rp != NULL) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 899 | for (i = 0; i < num_rows; i++) |
| 900 | { |
| 901 | png_bytep rptr = *rp; |
| 902 | png_read_row(png_ptr, rptr, png_bytep_NULL); |
| 903 | rp++; |
| 904 | } |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 905 | else if (dp != NULL) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 906 | for (i = 0; i < num_rows; i++) |
| 907 | { |
| 908 | png_bytep dptr = *dp; |
| 909 | png_read_row(png_ptr, png_bytep_NULL, dptr); |
| 910 | dp++; |
| 911 | } |
| 912 | } |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 913 | #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 914 | |
Joseph Wen | 4ce0ee1 | 2010-08-20 10:42:22 +0800 | [diff] [blame] | 915 | #ifdef PNG_INDEX_SUPPORTED |
| 916 | #define IDAT_HEADER_SIZE 8 |
| 917 | |
| 918 | /* Set the png read position to a new position based on idat_position and |
| 919 | * offset. |
| 920 | */ |
| 921 | void |
| 922 | png_set_read_offset(png_structp png_ptr, |
| 923 | png_uint_32 idat_position, png_uint_32 bytes_left) |
| 924 | { |
| 925 | png_seek_data(png_ptr, idat_position); |
| 926 | png_ptr->idat_size = png_read_chunk_header(png_ptr); |
| 927 | |
| 928 | // We need to add back IDAT_HEADER_SIZE because in zlib's perspective, |
| 929 | // IDAT_HEADER in PNG is already stripped out. |
| 930 | png_seek_data(png_ptr, idat_position + IDAT_HEADER_SIZE + png_ptr->idat_size - bytes_left); |
| 931 | png_ptr->idat_size = bytes_left; |
| 932 | } |
| 933 | |
| 934 | /* Configure png decoder to decode the pass starting from *row. |
| 935 | * The requested row may be adjusted to align with an indexing row. |
| 936 | * The actual row for the decoder to start its decoding will be returned in |
| 937 | * *row. |
| 938 | */ |
| 939 | void PNGAPI |
| 940 | png_configure_decoder(png_structp png_ptr, int *row, int pass) |
| 941 | { |
| 942 | png_indexp index = png_ptr->index; |
| 943 | int n = *row / index->step[pass]; |
| 944 | png_line_indexp line_index = index->pass_line_index[pass][n]; |
| 945 | |
| 946 | // Adjust row to an indexing row. |
| 947 | *row = n * index->step[pass]; |
| 948 | png_ptr->row_number = *row; |
| 949 | |
| 950 | #ifdef PNG_READ_INTERLACING_SUPPORTED |
| 951 | if (png_ptr->interlaced) |
| 952 | png_set_interlaced_pass(png_ptr, pass); |
| 953 | #endif |
| 954 | |
| 955 | long row_byte_length = |
| 956 | PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->iwidth) + 1; |
| 957 | |
| 958 | inflateEnd(&png_ptr->zstream); |
| 959 | inflateCopy(&png_ptr->zstream, line_index->z_state); |
| 960 | |
| 961 | // Set the png read position to line_index. |
| 962 | png_set_read_offset(png_ptr, line_index->stream_idat_position, |
| 963 | line_index->bytes_left_in_idat); |
| 964 | png_memcpy_check(png_ptr, |
| 965 | png_ptr->prev_row, line_index->prev_row, row_byte_length); |
| 966 | png_ptr->zstream.avail_in = 0; |
| 967 | } |
| 968 | |
| 969 | /* Build the line index and store the index in png_ptr->index. |
| 970 | */ |
| 971 | void PNGAPI |
| 972 | png_build_index(png_structp png_ptr) |
| 973 | { |
| 974 | // number of rows in a 8x8 block for each interlaced pass. |
| 975 | int number_rows_in_pass[7] = {1, 1, 1, 2, 2, 4, 4}; |
| 976 | |
| 977 | int ret; |
| 978 | png_uint_32 i, j; |
| 979 | png_bytep rp; |
| 980 | int p, pass_number = 1; |
| 981 | |
| 982 | #ifdef PNG_READ_INTERLACING_SUPPORTED |
| 983 | pass_number = png_set_interlace_handling(png_ptr); |
| 984 | #endif |
| 985 | |
| 986 | if (png_ptr == NULL) |
| 987 | return; |
| 988 | |
| 989 | png_read_start_row(png_ptr); |
| 990 | |
| 991 | #ifdef PNG_READ_INTERLACING_SUPPORTED |
| 992 | if (!png_ptr->interlaced) |
| 993 | #endif |
| 994 | { |
| 995 | number_rows_in_pass[0] = 8; |
| 996 | } |
| 997 | |
| 998 | rp = png_malloc(png_ptr, png_ptr->rowbytes); |
| 999 | |
| 1000 | png_indexp index = png_malloc(png_ptr, sizeof(png_index)); |
| 1001 | png_ptr->index = index; |
| 1002 | |
| 1003 | index->stream_idat_position = png_ptr->total_data_read - IDAT_HEADER_SIZE; |
| 1004 | |
| 1005 | // Set the default size of index in each pass to 0, |
| 1006 | // so that we can free index correctly in png_destroy_read_struct. |
| 1007 | for (p = 0; p < 7; p++) |
| 1008 | index->size[p] = 0; |
| 1009 | |
| 1010 | for (p = 0; p < pass_number; p++) |
| 1011 | { |
| 1012 | // We adjust the index step in each pass to make sure each pass |
| 1013 | // has roughly the same size of index. |
| 1014 | // This way, we won't consume to much memory in recording index. |
| 1015 | index->step[p] = INDEX_SAMPLE_SIZE * (8 / number_rows_in_pass[p]); |
| 1016 | index->size[p] = |
| 1017 | (png_ptr->height + index->step[p] - 1) / index->step[p]; |
| 1018 | index->pass_line_index[p] = |
| 1019 | png_malloc(png_ptr, index->size[p] * sizeof(png_line_indexp)); |
| 1020 | |
| 1021 | // Get the row_byte_length seen by the filter. This value may be |
| 1022 | // different from the row_byte_length of a bitmap in the case of |
| 1023 | // color palette mode. |
| 1024 | int row_byte_length = |
| 1025 | PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->iwidth) + 1; |
| 1026 | |
| 1027 | // Now, we record index for each indexing row. |
| 1028 | for (i = 0; i < index->size[p]; i++) |
| 1029 | { |
| 1030 | png_line_indexp line_index = png_malloc(png_ptr, sizeof(png_line_index)); |
| 1031 | index->pass_line_index[p][i] = line_index; |
| 1032 | |
| 1033 | line_index->z_state = png_malloc(png_ptr, sizeof(z_stream)); |
| 1034 | inflateCopy(line_index->z_state, &png_ptr->zstream); |
| 1035 | line_index->prev_row = png_malloc(png_ptr, row_byte_length); |
| 1036 | png_memcpy_check(png_ptr, |
| 1037 | line_index->prev_row, png_ptr->prev_row, row_byte_length); |
| 1038 | line_index->stream_idat_position = index->stream_idat_position; |
| 1039 | line_index->bytes_left_in_idat = png_ptr->idat_size + png_ptr->zstream.avail_in; |
| 1040 | |
| 1041 | // Skip the "step" number of rows to the next indexing row. |
| 1042 | for (j = 0; j < index->step[p] && |
| 1043 | i * index->step[p] + j < png_ptr->height; j++) |
| 1044 | { |
| 1045 | png_read_row(png_ptr, rp, png_bytep_NULL); |
| 1046 | } |
| 1047 | } |
| 1048 | } |
| 1049 | png_free(png_ptr, rp); |
| 1050 | } |
| 1051 | #endif |
| 1052 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1053 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1054 | /* Read the entire image. If the image has an alpha channel or a tRNS |
| 1055 | * chunk, and you have called png_handle_alpha()[*], you will need to |
| 1056 | * initialize the image to the current image that PNG will be overlaying. |
| 1057 | * We set the num_rows again here, in case it was incorrectly set in |
| 1058 | * png_read_start_row() by a call to png_read_update_info() or |
| 1059 | * png_start_read_image() if png_set_interlace_handling() wasn't called |
| 1060 | * prior to either of these functions like it should have been. You can |
| 1061 | * only call this function once. If you desire to have an image for |
| 1062 | * each pass of a interlaced image, use png_read_rows() instead. |
| 1063 | * |
| 1064 | * [*] png_handle_alpha() does not exist yet, as of this version of libpng |
| 1065 | */ |
| 1066 | void PNGAPI |
| 1067 | png_read_image(png_structp png_ptr, png_bytepp image) |
| 1068 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1069 | png_uint_32 i, image_height; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1070 | int pass, j; |
| 1071 | png_bytepp rp; |
| 1072 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1073 | png_debug(1, "in png_read_image"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1074 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1075 | if (png_ptr == NULL) |
| 1076 | return; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1077 | |
| 1078 | #ifdef PNG_READ_INTERLACING_SUPPORTED |
| 1079 | pass = png_set_interlace_handling(png_ptr); |
| 1080 | #else |
| 1081 | if (png_ptr->interlaced) |
| 1082 | png_error(png_ptr, |
| 1083 | "Cannot read interlaced image -- interlace handler disabled."); |
| 1084 | pass = 1; |
| 1085 | #endif |
| 1086 | |
| 1087 | |
| 1088 | image_height=png_ptr->height; |
| 1089 | png_ptr->num_rows = image_height; /* Make sure this is set correctly */ |
| 1090 | |
| 1091 | for (j = 0; j < pass; j++) |
| 1092 | { |
| 1093 | rp = image; |
| 1094 | for (i = 0; i < image_height; i++) |
| 1095 | { |
| 1096 | png_read_row(png_ptr, *rp, png_bytep_NULL); |
| 1097 | rp++; |
| 1098 | } |
| 1099 | } |
| 1100 | } |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1101 | #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1102 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1103 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1104 | /* Read the end of the PNG file. Will not read past the end of the |
| 1105 | * file, will verify the end is accurate, and will read any comments |
| 1106 | * or time information at the end of the file, if info is not NULL. |
| 1107 | */ |
| 1108 | void PNGAPI |
| 1109 | png_read_end(png_structp png_ptr, png_infop info_ptr) |
| 1110 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1111 | png_debug(1, "in png_read_end"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1112 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1113 | if (png_ptr == NULL) |
| 1114 | return; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1115 | png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */ |
| 1116 | |
| 1117 | do |
| 1118 | { |
| 1119 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1120 | PNG_CONST PNG_IHDR; |
| 1121 | PNG_CONST PNG_IDAT; |
| 1122 | PNG_CONST PNG_IEND; |
| 1123 | PNG_CONST PNG_PLTE; |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1124 | #ifdef PNG_READ_bKGD_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1125 | PNG_CONST PNG_bKGD; |
| 1126 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1127 | #ifdef PNG_READ_cHRM_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1128 | PNG_CONST PNG_cHRM; |
| 1129 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1130 | #ifdef PNG_READ_gAMA_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1131 | PNG_CONST PNG_gAMA; |
| 1132 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1133 | #ifdef PNG_READ_hIST_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1134 | PNG_CONST PNG_hIST; |
| 1135 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1136 | #ifdef PNG_READ_iCCP_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1137 | PNG_CONST PNG_iCCP; |
| 1138 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1139 | #ifdef PNG_READ_iTXt_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1140 | PNG_CONST PNG_iTXt; |
| 1141 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1142 | #ifdef PNG_READ_oFFs_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1143 | PNG_CONST PNG_oFFs; |
| 1144 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1145 | #ifdef PNG_READ_pCAL_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1146 | PNG_CONST PNG_pCAL; |
| 1147 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1148 | #ifdef PNG_READ_pHYs_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1149 | PNG_CONST PNG_pHYs; |
| 1150 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1151 | #ifdef PNG_READ_sBIT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1152 | PNG_CONST PNG_sBIT; |
| 1153 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1154 | #ifdef PNG_READ_sCAL_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1155 | PNG_CONST PNG_sCAL; |
| 1156 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1157 | #ifdef PNG_READ_sPLT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1158 | PNG_CONST PNG_sPLT; |
| 1159 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1160 | #ifdef PNG_READ_sRGB_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1161 | PNG_CONST PNG_sRGB; |
| 1162 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1163 | #ifdef PNG_READ_tEXt_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1164 | PNG_CONST PNG_tEXt; |
| 1165 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1166 | #ifdef PNG_READ_tIME_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1167 | PNG_CONST PNG_tIME; |
| 1168 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1169 | #ifdef PNG_READ_tRNS_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1170 | PNG_CONST PNG_tRNS; |
| 1171 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1172 | #ifdef PNG_READ_zTXt_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1173 | PNG_CONST PNG_zTXt; |
| 1174 | #endif |
| 1175 | #endif /* PNG_USE_LOCAL_ARRAYS */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1176 | png_uint_32 length = png_read_chunk_header(png_ptr); |
| 1177 | PNG_CONST png_bytep chunk_name = png_ptr->chunk_name; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1178 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1179 | if (!png_memcmp(chunk_name, png_IHDR, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1180 | png_handle_IHDR(png_ptr, info_ptr, length); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1181 | else if (!png_memcmp(chunk_name, png_IEND, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1182 | png_handle_IEND(png_ptr, info_ptr, length); |
| 1183 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1184 | else if (png_handle_as_unknown(png_ptr, chunk_name)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1185 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1186 | if (!png_memcmp(chunk_name, png_IDAT, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1187 | { |
| 1188 | if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) |
| 1189 | png_error(png_ptr, "Too many IDAT's found"); |
| 1190 | } |
| 1191 | png_handle_unknown(png_ptr, info_ptr, length); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1192 | if (!png_memcmp(chunk_name, png_PLTE, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1193 | png_ptr->mode |= PNG_HAVE_PLTE; |
| 1194 | } |
| 1195 | #endif |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1196 | else if (!png_memcmp(chunk_name, png_IDAT, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1197 | { |
| 1198 | /* Zero length IDATs are legal after the last IDAT has been |
| 1199 | * read, but not after other chunks have been read. |
| 1200 | */ |
| 1201 | if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) |
| 1202 | png_error(png_ptr, "Too many IDAT's found"); |
| 1203 | png_crc_finish(png_ptr, length); |
| 1204 | } |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1205 | else if (!png_memcmp(chunk_name, png_PLTE, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1206 | png_handle_PLTE(png_ptr, info_ptr, length); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1207 | #ifdef PNG_READ_bKGD_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1208 | else if (!png_memcmp(chunk_name, png_bKGD, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1209 | png_handle_bKGD(png_ptr, info_ptr, length); |
| 1210 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1211 | #ifdef PNG_READ_cHRM_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1212 | else if (!png_memcmp(chunk_name, png_cHRM, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1213 | png_handle_cHRM(png_ptr, info_ptr, length); |
| 1214 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1215 | #ifdef PNG_READ_gAMA_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1216 | else if (!png_memcmp(chunk_name, png_gAMA, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1217 | png_handle_gAMA(png_ptr, info_ptr, length); |
| 1218 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1219 | #ifdef PNG_READ_hIST_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1220 | else if (!png_memcmp(chunk_name, png_hIST, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1221 | png_handle_hIST(png_ptr, info_ptr, length); |
| 1222 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1223 | #ifdef PNG_READ_oFFs_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1224 | else if (!png_memcmp(chunk_name, png_oFFs, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1225 | png_handle_oFFs(png_ptr, info_ptr, length); |
| 1226 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1227 | #ifdef PNG_READ_pCAL_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1228 | else if (!png_memcmp(chunk_name, png_pCAL, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1229 | png_handle_pCAL(png_ptr, info_ptr, length); |
| 1230 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1231 | #ifdef PNG_READ_sCAL_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1232 | else if (!png_memcmp(chunk_name, png_sCAL, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1233 | png_handle_sCAL(png_ptr, info_ptr, length); |
| 1234 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1235 | #ifdef PNG_READ_pHYs_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1236 | else if (!png_memcmp(chunk_name, png_pHYs, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1237 | png_handle_pHYs(png_ptr, info_ptr, length); |
| 1238 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1239 | #ifdef PNG_READ_sBIT_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1240 | else if (!png_memcmp(chunk_name, png_sBIT, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1241 | png_handle_sBIT(png_ptr, info_ptr, length); |
| 1242 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1243 | #ifdef PNG_READ_sRGB_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1244 | else if (!png_memcmp(chunk_name, png_sRGB, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1245 | png_handle_sRGB(png_ptr, info_ptr, length); |
| 1246 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1247 | #ifdef PNG_READ_iCCP_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1248 | else if (!png_memcmp(chunk_name, png_iCCP, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1249 | png_handle_iCCP(png_ptr, info_ptr, length); |
| 1250 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1251 | #ifdef PNG_READ_sPLT_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1252 | else if (!png_memcmp(chunk_name, png_sPLT, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1253 | png_handle_sPLT(png_ptr, info_ptr, length); |
| 1254 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1255 | #ifdef PNG_READ_tEXt_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1256 | else if (!png_memcmp(chunk_name, png_tEXt, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1257 | png_handle_tEXt(png_ptr, info_ptr, length); |
| 1258 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1259 | #ifdef PNG_READ_tIME_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1260 | else if (!png_memcmp(chunk_name, png_tIME, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1261 | png_handle_tIME(png_ptr, info_ptr, length); |
| 1262 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1263 | #ifdef PNG_READ_tRNS_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1264 | else if (!png_memcmp(chunk_name, png_tRNS, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1265 | png_handle_tRNS(png_ptr, info_ptr, length); |
| 1266 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1267 | #ifdef PNG_READ_zTXt_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1268 | else if (!png_memcmp(chunk_name, png_zTXt, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1269 | png_handle_zTXt(png_ptr, info_ptr, length); |
| 1270 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1271 | #ifdef PNG_READ_iTXt_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1272 | else if (!png_memcmp(chunk_name, png_iTXt, 4)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1273 | png_handle_iTXt(png_ptr, info_ptr, length); |
| 1274 | #endif |
| 1275 | else |
| 1276 | png_handle_unknown(png_ptr, info_ptr, length); |
| 1277 | } while (!(png_ptr->mode & PNG_HAVE_IEND)); |
| 1278 | } |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1279 | #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1280 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1281 | /* Free all memory used by the read */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1282 | void PNGAPI |
| 1283 | png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, |
| 1284 | png_infopp end_info_ptr_ptr) |
| 1285 | { |
| 1286 | png_structp png_ptr = NULL; |
| 1287 | png_infop info_ptr = NULL, end_info_ptr = NULL; |
| 1288 | #ifdef PNG_USER_MEM_SUPPORTED |
| 1289 | png_free_ptr free_fn = NULL; |
| 1290 | png_voidp mem_ptr = NULL; |
| 1291 | #endif |
| 1292 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1293 | png_debug(1, "in png_destroy_read_struct"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1294 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1295 | if (png_ptr_ptr != NULL) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1296 | png_ptr = *png_ptr_ptr; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1297 | if (png_ptr == NULL) |
| 1298 | return; |
| 1299 | |
| 1300 | #ifdef PNG_USER_MEM_SUPPORTED |
| 1301 | free_fn = png_ptr->free_fn; |
| 1302 | mem_ptr = png_ptr->mem_ptr; |
| 1303 | #endif |
| 1304 | |
| 1305 | if (info_ptr_ptr != NULL) |
| 1306 | info_ptr = *info_ptr_ptr; |
| 1307 | |
| 1308 | if (end_info_ptr_ptr != NULL) |
| 1309 | end_info_ptr = *end_info_ptr_ptr; |
| 1310 | |
| 1311 | png_read_destroy(png_ptr, info_ptr, end_info_ptr); |
| 1312 | |
| 1313 | if (info_ptr != NULL) |
| 1314 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1315 | #ifdef PNG_TEXT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1316 | png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1); |
| 1317 | #endif |
| 1318 | |
| 1319 | #ifdef PNG_USER_MEM_SUPPORTED |
| 1320 | png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn, |
| 1321 | (png_voidp)mem_ptr); |
| 1322 | #else |
| 1323 | png_destroy_struct((png_voidp)info_ptr); |
| 1324 | #endif |
| 1325 | *info_ptr_ptr = NULL; |
| 1326 | } |
| 1327 | |
| 1328 | if (end_info_ptr != NULL) |
| 1329 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1330 | #ifdef PNG_READ_TEXT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1331 | png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1); |
| 1332 | #endif |
| 1333 | #ifdef PNG_USER_MEM_SUPPORTED |
| 1334 | png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn, |
| 1335 | (png_voidp)mem_ptr); |
| 1336 | #else |
| 1337 | png_destroy_struct((png_voidp)end_info_ptr); |
| 1338 | #endif |
| 1339 | *end_info_ptr_ptr = NULL; |
| 1340 | } |
| 1341 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1342 | if (png_ptr != NULL) |
| 1343 | { |
Joseph Wen | 4ce0ee1 | 2010-08-20 10:42:22 +0800 | [diff] [blame] | 1344 | #ifdef PNG_INDEX_SUPPORTED |
| 1345 | if (png_ptr->index) { |
| 1346 | unsigned int i, p; |
| 1347 | png_indexp index = png_ptr->index; |
| 1348 | for (p = 0; p < 7; p++) { |
| 1349 | for (i = 0; i < index->size[p]; i++) { |
| 1350 | inflateEnd(index->pass_line_index[p][i]->z_state); |
| 1351 | png_free(png_ptr, index->pass_line_index[p][i]->z_state); |
| 1352 | png_free(png_ptr, index->pass_line_index[p][i]->prev_row); |
| 1353 | png_free(png_ptr, index->pass_line_index[p][i]); |
| 1354 | } |
| 1355 | if (index->size[p] != 0) { |
| 1356 | png_free(png_ptr, index->pass_line_index[p]); |
| 1357 | } |
| 1358 | } |
| 1359 | png_free(png_ptr, index); |
| 1360 | } |
| 1361 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1362 | #ifdef PNG_USER_MEM_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1363 | png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn, |
| 1364 | (png_voidp)mem_ptr); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1365 | #else |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1366 | png_destroy_struct((png_voidp)png_ptr); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1367 | #endif |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1368 | *png_ptr_ptr = NULL; |
| 1369 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1370 | } |
| 1371 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1372 | /* Free all memory used by the read (old method) */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1373 | void /* PRIVATE */ |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1374 | png_read_destroy(png_structp png_ptr, png_infop info_ptr, |
| 1375 | png_infop end_info_ptr) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1376 | { |
| 1377 | #ifdef PNG_SETJMP_SUPPORTED |
| 1378 | jmp_buf tmp_jmp; |
| 1379 | #endif |
| 1380 | png_error_ptr error_fn; |
| 1381 | png_error_ptr warning_fn; |
| 1382 | png_voidp error_ptr; |
| 1383 | #ifdef PNG_USER_MEM_SUPPORTED |
| 1384 | png_free_ptr free_fn; |
| 1385 | #endif |
| 1386 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1387 | png_debug(1, "in png_read_destroy"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1388 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1389 | if (info_ptr != NULL) |
| 1390 | png_info_destroy(png_ptr, info_ptr); |
| 1391 | |
| 1392 | if (end_info_ptr != NULL) |
| 1393 | png_info_destroy(png_ptr, end_info_ptr); |
| 1394 | |
| 1395 | png_free(png_ptr, png_ptr->zbuf); |
| 1396 | png_free(png_ptr, png_ptr->big_row_buf); |
| 1397 | png_free(png_ptr, png_ptr->prev_row); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1398 | png_free(png_ptr, png_ptr->chunkdata); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1399 | #ifdef PNG_READ_DITHER_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1400 | png_free(png_ptr, png_ptr->palette_lookup); |
| 1401 | png_free(png_ptr, png_ptr->dither_index); |
| 1402 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1403 | #ifdef PNG_READ_GAMMA_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1404 | png_free(png_ptr, png_ptr->gamma_table); |
| 1405 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1406 | #ifdef PNG_READ_BACKGROUND_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1407 | png_free(png_ptr, png_ptr->gamma_from_1); |
| 1408 | png_free(png_ptr, png_ptr->gamma_to_1); |
| 1409 | #endif |
| 1410 | #ifdef PNG_FREE_ME_SUPPORTED |
| 1411 | if (png_ptr->free_me & PNG_FREE_PLTE) |
| 1412 | png_zfree(png_ptr, png_ptr->palette); |
| 1413 | png_ptr->free_me &= ~PNG_FREE_PLTE; |
| 1414 | #else |
| 1415 | if (png_ptr->flags & PNG_FLAG_FREE_PLTE) |
| 1416 | png_zfree(png_ptr, png_ptr->palette); |
| 1417 | png_ptr->flags &= ~PNG_FLAG_FREE_PLTE; |
| 1418 | #endif |
| 1419 | #if defined(PNG_tRNS_SUPPORTED) || \ |
| 1420 | defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
| 1421 | #ifdef PNG_FREE_ME_SUPPORTED |
| 1422 | if (png_ptr->free_me & PNG_FREE_TRNS) |
| 1423 | png_free(png_ptr, png_ptr->trans); |
| 1424 | png_ptr->free_me &= ~PNG_FREE_TRNS; |
| 1425 | #else |
| 1426 | if (png_ptr->flags & PNG_FLAG_FREE_TRNS) |
| 1427 | png_free(png_ptr, png_ptr->trans); |
| 1428 | png_ptr->flags &= ~PNG_FLAG_FREE_TRNS; |
| 1429 | #endif |
| 1430 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1431 | #ifdef PNG_READ_hIST_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1432 | #ifdef PNG_FREE_ME_SUPPORTED |
| 1433 | if (png_ptr->free_me & PNG_FREE_HIST) |
| 1434 | png_free(png_ptr, png_ptr->hist); |
| 1435 | png_ptr->free_me &= ~PNG_FREE_HIST; |
| 1436 | #else |
| 1437 | if (png_ptr->flags & PNG_FLAG_FREE_HIST) |
| 1438 | png_free(png_ptr, png_ptr->hist); |
| 1439 | png_ptr->flags &= ~PNG_FLAG_FREE_HIST; |
| 1440 | #endif |
| 1441 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1442 | #ifdef PNG_READ_GAMMA_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1443 | if (png_ptr->gamma_16_table != NULL) |
| 1444 | { |
| 1445 | int i; |
| 1446 | int istop = (1 << (8 - png_ptr->gamma_shift)); |
| 1447 | for (i = 0; i < istop; i++) |
| 1448 | { |
| 1449 | png_free(png_ptr, png_ptr->gamma_16_table[i]); |
| 1450 | } |
| 1451 | png_free(png_ptr, png_ptr->gamma_16_table); |
| 1452 | } |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1453 | #ifdef PNG_READ_BACKGROUND_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1454 | if (png_ptr->gamma_16_from_1 != NULL) |
| 1455 | { |
| 1456 | int i; |
| 1457 | int istop = (1 << (8 - png_ptr->gamma_shift)); |
| 1458 | for (i = 0; i < istop; i++) |
| 1459 | { |
| 1460 | png_free(png_ptr, png_ptr->gamma_16_from_1[i]); |
| 1461 | } |
| 1462 | png_free(png_ptr, png_ptr->gamma_16_from_1); |
| 1463 | } |
| 1464 | if (png_ptr->gamma_16_to_1 != NULL) |
| 1465 | { |
| 1466 | int i; |
| 1467 | int istop = (1 << (8 - png_ptr->gamma_shift)); |
| 1468 | for (i = 0; i < istop; i++) |
| 1469 | { |
| 1470 | png_free(png_ptr, png_ptr->gamma_16_to_1[i]); |
| 1471 | } |
| 1472 | png_free(png_ptr, png_ptr->gamma_16_to_1); |
| 1473 | } |
| 1474 | #endif |
| 1475 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1476 | #ifdef PNG_TIME_RFC1123_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1477 | png_free(png_ptr, png_ptr->time_buffer); |
| 1478 | #endif |
| 1479 | |
| 1480 | inflateEnd(&png_ptr->zstream); |
| 1481 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| 1482 | png_free(png_ptr, png_ptr->save_buffer); |
| 1483 | #endif |
| 1484 | |
| 1485 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| 1486 | #ifdef PNG_TEXT_SUPPORTED |
| 1487 | png_free(png_ptr, png_ptr->current_text); |
| 1488 | #endif /* PNG_TEXT_SUPPORTED */ |
| 1489 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| 1490 | |
| 1491 | /* Save the important info out of the png_struct, in case it is |
| 1492 | * being used again. |
| 1493 | */ |
| 1494 | #ifdef PNG_SETJMP_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1495 | png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1496 | #endif |
| 1497 | |
| 1498 | error_fn = png_ptr->error_fn; |
| 1499 | warning_fn = png_ptr->warning_fn; |
| 1500 | error_ptr = png_ptr->error_ptr; |
| 1501 | #ifdef PNG_USER_MEM_SUPPORTED |
| 1502 | free_fn = png_ptr->free_fn; |
| 1503 | #endif |
| 1504 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1505 | png_memset(png_ptr, 0, png_sizeof(png_struct)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1506 | |
| 1507 | png_ptr->error_fn = error_fn; |
| 1508 | png_ptr->warning_fn = warning_fn; |
| 1509 | png_ptr->error_ptr = error_ptr; |
| 1510 | #ifdef PNG_USER_MEM_SUPPORTED |
| 1511 | png_ptr->free_fn = free_fn; |
| 1512 | #endif |
| 1513 | |
| 1514 | #ifdef PNG_SETJMP_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1515 | png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1516 | #endif |
| 1517 | |
| 1518 | } |
| 1519 | |
| 1520 | void PNGAPI |
| 1521 | png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn) |
| 1522 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1523 | if (png_ptr == NULL) |
| 1524 | return; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1525 | png_ptr->read_row_fn = read_row_fn; |
| 1526 | } |
| 1527 | |
| 1528 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1529 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
| 1530 | #ifdef PNG_INFO_IMAGE_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1531 | void PNGAPI |
| 1532 | png_read_png(png_structp png_ptr, png_infop info_ptr, |
| 1533 | int transforms, |
| 1534 | voidp params) |
| 1535 | { |
| 1536 | int row; |
| 1537 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1538 | if (png_ptr == NULL) |
| 1539 | return; |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1540 | #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1541 | /* Invert the alpha channel from opacity to transparency |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1542 | */ |
| 1543 | if (transforms & PNG_TRANSFORM_INVERT_ALPHA) |
| 1544 | png_set_invert_alpha(png_ptr); |
| 1545 | #endif |
| 1546 | |
| 1547 | /* png_read_info() gives us all of the information from the |
| 1548 | * PNG file before the first IDAT (image data chunk). |
| 1549 | */ |
| 1550 | png_read_info(png_ptr, info_ptr); |
| 1551 | if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep)) |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1552 | png_error(png_ptr, "Image is too high to process with png_read_png()"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1553 | |
| 1554 | /* -------------- image transformations start here ------------------- */ |
| 1555 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1556 | #ifdef PNG_READ_16_TO_8_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1557 | /* Tell libpng to strip 16 bit/color files down to 8 bits per color. |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1558 | */ |
| 1559 | if (transforms & PNG_TRANSFORM_STRIP_16) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1560 | png_set_strip_16(png_ptr); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1561 | #endif |
| 1562 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1563 | #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1564 | /* Strip alpha bytes from the input data without combining with |
| 1565 | * the background (not recommended). |
| 1566 | */ |
| 1567 | if (transforms & PNG_TRANSFORM_STRIP_ALPHA) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1568 | png_set_strip_alpha(png_ptr); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1569 | #endif |
| 1570 | |
| 1571 | #if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED) |
| 1572 | /* Extract multiple pixels with bit depths of 1, 2, or 4 from a single |
| 1573 | * byte into separate bytes (useful for paletted and grayscale images). |
| 1574 | */ |
| 1575 | if (transforms & PNG_TRANSFORM_PACKING) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1576 | png_set_packing(png_ptr); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1577 | #endif |
| 1578 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1579 | #ifdef PNG_READ_PACKSWAP_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1580 | /* Change the order of packed pixels to least significant bit first |
| 1581 | * (not useful if you are using png_set_packing). |
| 1582 | */ |
| 1583 | if (transforms & PNG_TRANSFORM_PACKSWAP) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1584 | png_set_packswap(png_ptr); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1585 | #endif |
| 1586 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1587 | #ifdef PNG_READ_EXPAND_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1588 | /* Expand paletted colors into true RGB triplets |
| 1589 | * Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel |
| 1590 | * Expand paletted or RGB images with transparency to full alpha |
| 1591 | * channels so the data will be available as RGBA quartets. |
| 1592 | */ |
| 1593 | if (transforms & PNG_TRANSFORM_EXPAND) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1594 | if ((png_ptr->bit_depth < 8) || |
| 1595 | (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) || |
| 1596 | (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1597 | png_set_expand(png_ptr); |
| 1598 | #endif |
| 1599 | |
| 1600 | /* We don't handle background color or gamma transformation or dithering. |
| 1601 | */ |
| 1602 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1603 | #ifdef PNG_READ_INVERT_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1604 | /* Invert monochrome files to have 0 as white and 1 as black |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1605 | */ |
| 1606 | if (transforms & PNG_TRANSFORM_INVERT_MONO) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1607 | png_set_invert_mono(png_ptr); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1608 | #endif |
| 1609 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1610 | #ifdef PNG_READ_SHIFT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1611 | /* If you want to shift the pixel values from the range [0,255] or |
| 1612 | * [0,65535] to the original [0,7] or [0,31], or whatever range the |
| 1613 | * colors were originally in: |
| 1614 | */ |
| 1615 | if ((transforms & PNG_TRANSFORM_SHIFT) |
| 1616 | && png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT)) |
| 1617 | { |
| 1618 | png_color_8p sig_bit; |
| 1619 | |
| 1620 | png_get_sBIT(png_ptr, info_ptr, &sig_bit); |
| 1621 | png_set_shift(png_ptr, sig_bit); |
| 1622 | } |
| 1623 | #endif |
| 1624 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1625 | #ifdef PNG_READ_BGR_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1626 | /* Flip the RGB pixels to BGR (or RGBA to BGRA) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1627 | */ |
| 1628 | if (transforms & PNG_TRANSFORM_BGR) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1629 | png_set_bgr(png_ptr); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1630 | #endif |
| 1631 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1632 | #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1633 | /* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1634 | */ |
| 1635 | if (transforms & PNG_TRANSFORM_SWAP_ALPHA) |
| 1636 | png_set_swap_alpha(png_ptr); |
| 1637 | #endif |
| 1638 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1639 | #ifdef PNG_READ_SWAP_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1640 | /* Swap bytes of 16 bit files to least significant byte first |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1641 | */ |
| 1642 | if (transforms & PNG_TRANSFORM_SWAP_ENDIAN) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1643 | png_set_swap(png_ptr); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1644 | #endif |
| 1645 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1646 | /* Added at libpng-1.2.41 */ |
| 1647 | #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED |
| 1648 | /* Invert the alpha channel from opacity to transparency |
| 1649 | */ |
| 1650 | if (transforms & PNG_TRANSFORM_INVERT_ALPHA) |
| 1651 | png_set_invert_alpha(png_ptr); |
| 1652 | #endif |
| 1653 | |
| 1654 | /* Added at libpng-1.2.41 */ |
| 1655 | #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED |
| 1656 | /* Expand grayscale image to RGB |
| 1657 | */ |
| 1658 | if (transforms & PNG_TRANSFORM_GRAY_TO_RGB) |
| 1659 | png_set_gray_to_rgb(png_ptr); |
| 1660 | #endif |
| 1661 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1662 | /* We don't handle adding filler bytes */ |
| 1663 | |
| 1664 | /* Optional call to gamma correct and add the background to the palette |
| 1665 | * and update info structure. REQUIRED if you are expecting libpng to |
| 1666 | * update the palette for you (i.e., you selected such a transform above). |
| 1667 | */ |
| 1668 | png_read_update_info(png_ptr, info_ptr); |
| 1669 | |
| 1670 | /* -------------- image transformations end here ------------------- */ |
| 1671 | |
| 1672 | #ifdef PNG_FREE_ME_SUPPORTED |
| 1673 | png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0); |
| 1674 | #endif |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1675 | if (info_ptr->row_pointers == NULL) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1676 | { |
| 1677 | info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr, |
| 1678 | info_ptr->height * png_sizeof(png_bytep)); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1679 | png_memset(info_ptr->row_pointers, 0, info_ptr->height |
| 1680 | * png_sizeof(png_bytep)); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1681 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1682 | #ifdef PNG_FREE_ME_SUPPORTED |
| 1683 | info_ptr->free_me |= PNG_FREE_ROWS; |
| 1684 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1685 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1686 | for (row = 0; row < (int)info_ptr->height; row++) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1687 | info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr, |
| 1688 | png_get_rowbytes(png_ptr, info_ptr)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1689 | } |
| 1690 | |
| 1691 | png_read_image(png_ptr, info_ptr->row_pointers); |
| 1692 | info_ptr->valid |= PNG_INFO_IDAT; |
| 1693 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1694 | /* Read rest of file, and get additional chunks in info_ptr - REQUIRED */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1695 | png_read_end(png_ptr, info_ptr); |
| 1696 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1697 | transforms = transforms; /* Quiet compiler warnings */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1698 | params = params; |
| 1699 | |
| 1700 | } |
| 1701 | #endif /* PNG_INFO_IMAGE_SUPPORTED */ |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1702 | #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1703 | #endif /* PNG_READ_SUPPORTED */ |